Comments in pickles?

[Roy Smith]

I've got a file parser that returns a data structure.  As part of a 
regression test suite, I'm going to parse several sample files and save 
the resulting data structures as pickle files to compare against future 
versions.  I want to check those pickles into CVS.

Our usual practice is to imbed the CVS id string ($Id: ) in every 
checked-in file as a comment.  Is there any way to do that with a 
pickle?  Does a comment convention exist which cPickle.load() 
understands?